 /*******************************************************************************
  * Copyright (c) 2000, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui;

 /**
  * A part service tracks the creation and activation of parts within a
  * workbench page.
  * <p>
  * This interface is not intended to be implemented by clients.
  * </p>
  *
  * @see IWorkbenchPage
  */
 public interface IPartService {

     /**
      * Adds the given listener for part lifecycle events.
      * Has no effect if an identical listener is already registered.
      *
      * @param listener a part listener
      */
     public void addPartListener(IPartListener listener);

     /**
      * Adds the given listener for part lifecycle events.
      * Has no effect if an identical listener is already registered.
      *
      * @param listener a part listener
      */
     public void addPartListener(IPartListener2 listener);

     /**
      * Returns the active part.
      *
      * @return the active part, or <code>null</code> if no part is currently active
      */
     public IWorkbenchPart getActivePart();

     /**
      * Returns the active part reference.
      *
      * @return the active part reference, or <code>null</code> if no part
      * is currently active
      */
     public IWorkbenchPartReference getActivePartReference();

     /**
      * Removes the given part listener.
      * Has no affect if an identical listener is not registered.
      *
      * @param listener a part listener
      */
     public void removePartListener(IPartListener listener);

     /**
      * Removes the given part listener.
      * Has no affect if an identical listener is not registered.
      *
      * @param listener a part listener
      */
     public void removePartListener(IPartListener2 listener);
 }

